diff --git a/autogpt_platform/backend/migrations/20251126113000_add_llm_registry/migration.sql b/autogpt_platform/backend/migrations/20251126113000_add_llm_registry/migration.sql
index 704bc17486..017c4244d6 100644
--- a/autogpt_platform/backend/migrations/20251126113000_add_llm_registry/migration.sql
+++ b/autogpt_platform/backend/migrations/20251126113000_add_llm_registry/migration.sql
@@ -70,6 +70,9 @@ CREATE INDEX "LlmModelCost_llmModelId_idx" ON "LlmModelCost"("llmModelId");
 -- CreateIndex
 CREATE INDEX "LlmModelCost_credentialProvider_idx" ON "LlmModelCost"("credentialProvider");
 
+-- CreateIndex
+CREATE UNIQUE INDEX "LlmModelCost_llmModelId_credentialProvider_unit_key" ON "LlmModelCost"("llmModelId", "credentialProvider", "unit");
+
 -- AddForeignKey
 ALTER TABLE "LlmModel" ADD CONSTRAINT "LlmModel_providerId_fkey" FOREIGN KEY ("providerId") REFERENCES "LlmProvider"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
 
diff --git a/autogpt_platform/backend/migrations/20251126120000_seed_llm_registry/migration.sql b/autogpt_platform/backend/migrations/20251126120000_seed_llm_registry/migration.sql
index a59ee716fa..2163d533bf 100644
--- a/autogpt_platform/backend/migrations/20251126120000_seed_llm_registry/migration.sql
+++ b/autogpt_platform/backend/migrations/20251126120000_seed_llm_registry/migration.sql
@@ -221,5 +221,6 @@ FROM (VALUES
     ('v0-1.0-md', 1)
 ) AS costs(model_slug, cost)
 JOIN model_ids m ON m."slug" = costs.model_slug
-JOIN provider_ids p ON p."id" = m."providerId";
+JOIN provider_ids p ON p."id" = m."providerId"
+ON CONFLICT ("llmModelId", "credentialProvider", "unit") DO NOTHING;
 
diff --git a/autogpt_platform/backend/schema.prisma b/autogpt_platform/backend/schema.prisma
index 3a248320c2..84b101a1dd 100644
--- a/autogpt_platform/backend/schema.prisma
+++ b/autogpt_platform/backend/schema.prisma
@@ -1198,6 +1198,7 @@ model LlmModelCost {
   llmModelId String
   Model      LlmModel @relation(fields: [llmModelId], references: [id], onDelete: Cascade)
 
+  @@unique([llmModelId, credentialProvider, unit])
   @@index([llmModelId])
   @@index([credentialProvider])
 }